Microchip Technology AT45DB011D-SSH-T

Overview

AT45DB011D-SSH-T from Adesto Technologies (now part of Dialog Semiconductor) is a 1-Mbit serial DataFlash® memory IC with RapidS SPI interface, organized as 512 pages × 256/264 bytes, supporting 66 MHz clock frequency, single 2.7–3.6 V supply, and industrial temperature range. It integrates one 256/264-byte SRAM buffer and enables code shadowing in embedded microcontroller boot systems.

For engineers reviewing the AT45DB011D-SSH-T datasheet, AT45DB011D-SSH-T pinout, AT45DB011D-SSH-T application, or AT45DB011D-SSH-T equivalent, key selection considerations include page-size configurability (256 vs. 264 bytes), sector lockdown security, continuous array read capability, and low-power deep power-down mode (15 µA typical).

Technical Context

The AT45DB011D-SSH-T implements a dual-level memory architecture: main Flash array (512 pages) plus a dedicated 256/264-byte SRAM buffer for temporary data staging. Its RapidS interface supports SPI Modes 0 and 3 with up to 66 MHz SCK, enabling high-speed sequential reads without address retransmission across page boundaries.

It features hardware write protection (WP pin), software-controlled sector protection, and a 128-byte security register with 64-byte user-programmable space and unique 64-byte device identifier. All program/erase operations are self-timed and require no external high-voltage supply.

Key Specifications

Pinout & Package

AT45DB011D-SSH-T is housed in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and halide-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial Flash memory applications.

Compared with W25Q80DVSSIG and MX25L1006EM1I-12G, the AT45DB011D-SSH-T uniquely combines SRAM buffer-based EEPROM emulation, sector lockdown security, and 15 µA deep power-down - making it optimal for secure, low-power, code-shadowing applications where byte-level alterability and tamper resistance are critical.

Availability

AT45DB011D-SSH-T is available at Aetrix Electronics and suitable for firmware boot storage, industrial data logging, secure configuration storage, and IoT edge device parameter storage requiring stable component supply and long-term lifecycle support.

Supply support for AT45DB011D-SSH-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Adesto Technologies, acquired by Dialog Semiconductor in 2020, specialized in low-power, nonvolatile memory and IoT connectivity solutions.

The AT45DB011D-SSH-T belongs to the DataFlash® family, designed specifically for embedded systems needing high-speed serial Flash with integrated buffer and security features - targeting code shadowing, secure firmware storage, and reliable data logging.

FAQ

What is the maximum clock frequency supported by the AT45DB011D-SSH-T for continuous array read?

The AT45DB011D-SSH-T supports up to 66 MHz for continuous array read in both Legacy (E8H) and High-Frequency (0BH) modes, as specified by the fCAR1 parameter. This enables real-time code shadowing from Flash into RAM without CPU wait states. The device maintains this speed regardless of page size configuration (256 or 264 bytes), and the internal address counter automatically wraps across page boundaries with zero delay.

Does the AT45DB011D-SSH-T require high-voltage programming or external charge pumps?

No, the AT45DB011D-SSH-T operates entirely from a single 2.7–3.6 V supply for both read and program/erase functions. All internal programming and erase cycles are self-timed and use on-chip charge pumps - eliminating the need for external high-voltage generators or complex power sequencing. This simplifies system design and improves reliability in space-constrained or battery-powered applications using the AT45DB011D-SSH-T.

How does the SRAM buffer in the AT45DB011D-SSH-T enable EEPROM emulation?

The AT45DB011D-SSH-T uses its 256/264-byte SRAM buffer to perform a self-contained three-step read-modify-write operation: first read a page into the buffer, modify desired bytes, then write the updated buffer contents back to Flash. This emulates byte- or bit-alterable EEPROM behavior without requiring external logic. The AT45DB011D-SSH-T's buffer eliminates the need for external RAM or software-managed wear leveling in applications like parameter storage or calibration data updates.

Can the AT45DB011D-SSH-T be used in industrial temperature environments?

Yes, the AT45DB011D-SSH-T is rated for industrial temperature range (–40°C to +85°C), verified across all electrical specifications including 66 MHz operation, 100,000 program/erase cycles, and 20-year data retention. Its SOIC package (SSH-T suffix) is qualified for extended thermal cycling and humidity exposure, making the AT45DB011D-SSH-T suitable for deployment in programmable logic controllers, motor drives, and outdoor IoT gateways.

What security mechanisms does the AT45DB011D-SSH-T provide for protecting stored data?

The AT45DB011D-SSH-T provides multiple hardware-enforced security layers: a 128-byte security register (64-byte user space + 64-byte unique ID), individual sector lockdown, and independent hardware write protection via the WP pin. Sector lockdown persists through power cycles and cannot be overridden by software commands. These features collectively protect bootloader code, calibration data, and regulatory certificates - ensuring the AT45DB011D-SSH-T meets requirements for secure embedded firmware storage.